A cationic dyeable pet and composite elastic fiber made therefrom

A composite elastic fiber and cation technology, applied in the field of composite elastic fibers, can solve the problems of easy dyeing, deactivation of transesterification catalysts, affecting the color of PET products, etc., to avoid side reactions.

Active Publication Date: 2022-05-31
ZHANGJIAGANG GLORY CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, during the preparation of PET fibers, the catalytic degradation of sulfonic acid groups and ethylene glycol due to the addition of sodium sulfonate isophthalate and ethylene glycol under the catalysis of titanium dioxide at high temperature not only affects the product color of PET, At the same time, it also deactivates the transesterification catalyst, making it difficult to increase the molecular weight of PET.
[0004] CN103183817A discloses a modified PTT copolyester and its preparation method and application, CN103724605A discloses a continuous polymerization preparation method of flame-retardant and antistatic PTT polyester and the prepared polyester, and CN104031251A discloses a cationic dye easy-to-dye , the continuous polymerization preparation method of antistatic PTT copolymers, which cannot solve the problem of catalytic degradation of the introduced functional modification component sulfonic acid group due to the catalytic activity of titanium dioxide under high temperature conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The present embodiment provides a preparation method of cationically dyeable PET, which comprises the following steps:

[0055] Put titanium dioxide, terephthalic acid and ethylene glycol in a beating kettle, stir and mix at 100 ° C, increase the stirring speed from 500 r / min to 1500 r / min within 10 minutes, and then keep at 1500 r / min for 45 minutes, complete The slurry is prepared by beating, wherein the mass fraction of titanium dioxide in the slurry is 1.0%, and the molar ratio of terephthalic acid and ethylene glycol is 1:1.10.

[0056] Using nitrogen as the protective gas, the slurry was esterified. The esterification pressure was controlled to be 0.40MPa, the esterification temperature was 235°C, and the esterification time was 2.0h. , Esterification under normal pressure conditions for 1.0h, the esterification is completed, and the esterification product is prepared.

[0057] The esterification product is subjected to pre-polycondensation reaction, the temperat...

Embodiment 2

[0064] The present embodiment provides a method for preparing a cationically dyeable PET / PTT composite elastic fiber, which comprises the following steps:

[0065] The cationic dyeable PET and conventional PTT provided in Example 1 were melt-extruded through a screw, and then formed by a composite melt-spinning assembly to prepare a cationic dyeable PET / PTT composite elastic fiber. In the PET / PTT composite elastic fiber, The mass ratio of conventional PTT to cationically dyeable PET is 40:60.

[0066] When preparing PET / PTT composite elastic fiber, it can be made into composite elastic POY fiber or composite elastic DTY fiber; wherein,

[0067] The preparation process of composite elastic POY fiber includes: preparing cationically dyeable PET melt and PTT melt respectively - entering the spinning box - entering the spinning assembly - cooling and solidifying - winding and forming;

[0068] The melt enters the spinning box stage, and the temperature of the PET spinning box is ...

Embodiment 3

[0076] The present embodiment provides a preparation method of cationically dyeable PET, which comprises the following steps:

[0077] Put titanium dioxide, terephthalic acid and ethylene glycol in a beating kettle, stir and mix at 110°C, increase the stirring speed from 500r / min to 1500r / min within 10min, and then keep at 1500r / min for 45min, After the beating is completed, a slurry is prepared; wherein, the mass fraction of titanium dioxide in the slurry is 1.5%, and the molar ratio of terephthalic acid to ethylene glycol is 1:1.20.

[0078] Using nitrogen as the protective gas, the slurry was esterified. The esterification pressure was controlled to be 0.45MPa, the esterification temperature was 245℃, and the esterification time was 3.0h. , Esterification under normal pressure conditions for 1.5h, the esterification is completed, and the esterification product is prepared.

[0079] The esterification product is subjected to pre-polycondensation reaction, the temperature of...

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Abstract

The invention provides a cationic dyeable PET and a composite elastic fiber prepared therefrom. The preparation method of cationic dyeable PET includes: mixing titanium dioxide, terephthalic acid and ethylene glycol and beating to obtain a slurry; performing esterification and precondensation on the slurry respectively, and adding dihydroxyisophthalic acid to the precondensation product Propyl ester-5-sodium sulfonate is initially melt-blended to obtain the primary product of cationic dyeable PET; the primary product of cationic dyeable PET is subjected to solid-phase viscosity increasing treatment to obtain cationic dyeable PET. Cationic dyeable PET / PTT composite elastic fiber is prepared by melt composite spinning of cationic dyeable PET and PTT. The technical solution provided by the invention effectively solves the problem that the current PET fiber is difficult to unify with full extinction and deep dyeing. The prepared product has good performance, high added value, easy process realization, and is conducive to large-scale production. It is suitable for elastic fabrics such as clothing and home textiles Wide application prospects.

Description

technical field [0001] The invention relates to a cationic dyeable PET and a composite elastic fiber prepared therefrom, belonging to the field of fiber forming and processing. Background technique [0002] Chemical fiber is an important raw material in the textile field. China is a big country of chemical fiber. In terms of the output of chemical fiber, China's chemical fiber production capacity reached more than 40 million tons in 2015, of which polyester fiber accounted for 70% of the total output of chemical fiber. Improving the differentiation and functionalization level of polyester fibers is directly related to the upgrading of polyester products. Comfort modification is the development trend of polyester fiber differentiation and functionalization, in which gloss and dyeing properties are the basis of comfortable polyester fiber products. [0003] At present, in the process of PET fiber preparation, the sulfonic acid group and ethylene glycol are degraded due to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/688C08G63/80C08K3/22D01F8/14
CPCC08G63/6886C08G63/80C08K3/22D01F8/14C08K2003/2241Y02P70/62
Inventor 严建华韩冰
Owner ZHANGJIAGANG GLORY CHEM IND CO LTD
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